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  #1  
Old 08-19-2010, 03:10 PM
Fritz 51 Fritz 51 is offline
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Default 99 4.0 6 cylinder. Loud engine noise

Little help here fellas. I gotta a 99 Ranger, 6 cylinder with a 4.0. There is an intermittent loud noise under the hood that sounds like somebody running a shop vac under there. Every once in a while it sounds like it is loading up and then the engine almost dies only to start the whole thing over again. Doesn't matter if the a.c. is engaged or not but it doesn't seem to make the noise in the winter. Only in warm weather. Not to bad when I first start up in the morning but when the engine warms up look out. What do you think?
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Old 08-19-2010, 05:14 PM
jkh jkh is offline
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Default Re: 99 4.0 6 cylinder. Loud engine noise

Its the IAC quite common. mine does same thing ill clean it one of these days see if it helps. instructions in how to section.
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Old 08-27-2010, 08:37 PM
Fritz 51 Fritz 51 is offline
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Default Re: 99 4.0 6 cylinder. Loud engine noise

Thanks JKH. Cleaning the IAC worked for a while but I ended up buying a new one at Advance Auto Parts for $60. Problem solved.
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